Here is the full list of all 30 DUSK achievements. It takes around 15-20 hours to unlock all of the achievements on Windows.
Earn the 'Untouchable' award
Beat a level on 'Duskmare'
Reach E1MS
Earn the 'Completionist' award
Find Rachael's secret
Get past wave 10 in Endless Mode
Get past wave 5 in Endless Mode
Open Duskworld
Complete all three episodes
Complete episode 1
Complete episode 2
Complete episode 3
Earn the 'Pacifist' award
Earn the 'Low Tech" award
Earn the 'Completionist' award in every level
Beat par time in a level
Find Lavender's secret
Pick up a bar of soap in each level
Get past wave 20 in Endless Mode
Watch the credits to the end
Find Dopefish
Find 'Wife of Intoxigator'
Find a "You aren't supposed to be here go away" sign
Reach E3MS
Reach E2MS
Kill Intoxigator while intoxicated
Use cheats
Telefrag the Guardian
Neutralize Chomper
Kill an enemy by spinning your weapons